Question

in the activity of a cardboard glass and 5 rupee coin why does the coin fell into the glass when a sharp horizontal flick is given to the cardboard?

Answer 1

Answer:

You find that whether the coin falls in the beaker or not depends on the length of the card and the force with which you flick. It also depends on the friction at the surfaces of contact.

As soon as the card begins to move it slips against the coin and exerts a forward force on the coin. By the time coin runs out of card’s surface below, the coin also moves a little in forward direction. The coin falls in the beaker only if this forward displacement is smaller than the radius of the beaker. Otherwise it falls outside the beaker. Thus in no case, the coin ``remains at its own place'' as the card moves out.